/* Interface to Little CMS
Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see . */
#include
#ifdef HAVE_LCMS2
#include
#include
#include "lisp.h"
#ifdef WINDOWSNT
# include
# include "w32.h"
DEF_DLL_FN (cmsFloat64Number, cmsCIE2000DeltaE,
(const cmsCIELab* Lab1, const cmsCIELab* Lab2, cmsFloat64Number Kl,
cmsFloat64Number Kc, cmsFloat64Number Kh));
DEF_DLL_FN (cmsHANDLE, cmsCIECAM02Init,
(cmsContext ContextID, const cmsViewingConditions* pVC));
DEF_DLL_FN (void, cmsCIECAM02Forward,
(cmsHANDLE hModel, const cmsCIEXYZ* pIn, cmsJCh* pOut));
DEF_DLL_FN (void, cmsCIECAM02Done, (cmsHANDLE hModel));
DEF_DLL_FN (cmsBool, cmsWhitePointFromTemp,
(cmsCIExyY* WhitePoint, cmsFloat64Number TempK));
DEF_DLL_FN (void, cmsxyY2XYZ, (cmsCIEXYZ* Dest, const cmsCIExyY* Source));
static bool lcms_initialized;
static bool
init_lcms_functions (void)
{
HMODULE library = w32_delayed_load (Qlcms2);
if (!library)
return false;
LOAD_DLL_FN (library, cmsCIE2000DeltaE);
LOAD_DLL_FN (library, cmsCIECAM02Init);
LOAD_DLL_FN (library, cmsCIECAM02Forward);
LOAD_DLL_FN (library, cmsCIECAM02Done);
LOAD_DLL_FN (library, cmsWhitePointFromTemp);
LOAD_DLL_FN (library, cmsxyY2XYZ);
return true;
}
# undef cmsCIE2000DeltaE
# undef cmsCIECAM02Init
# undef cmsCIECAM02Forward
# undef cmsCIECAM02Done
# undef cmsWhitePointFromTemp
# undef cmsxyY2XYZ
# define cmsCIE2000DeltaE fn_cmsCIE2000DeltaE
# define cmsCIECAM02Init fn_cmsCIECAM02Init
# define cmsCIECAM02Forward fn_cmsCIECAM02Forward
# define cmsCIECAM02Done fn_cmsCIECAM02Done
# define cmsWhitePointFromTemp fn_cmsWhitePointFromTemp
# define cmsxyY2XYZ fn_cmsxyY2XYZ
#endif /* WINDOWSNT */
static bool
lcms2_available_p (void)
{
#ifdef WINDOWSNT
Lisp_Object found = Fassq (Qlcms2, Vlibrary_cache);
if (CONSP (found))
return NILP (XCDR (found)) ? false : true;
else
{
Lisp_Object status;
lcms_initialized = init_lcms_functions ();
status = lcms_initialized;
Vlibrary_cache = Fcons (Fcons (Qlcms2, status), Vlibrary_cache);
return status;
}
#else /* !WINDOWSNT */
return true;
#endif
}
static bool
parse_lab_list (Lisp_Object lab_list, cmsCIELab *color)
{
#define PARSE_LAB_LIST_FIELD(field) \
if (CONSP (lab_list) && NUMBERP (XCAR (lab_list))) \
{ \
color->field = XFLOATINT (XCAR (lab_list)); \
lab_list = XCDR (lab_list); \
} \
else \
return false;
PARSE_LAB_LIST_FIELD (L);
PARSE_LAB_LIST_FIELD (a);
PARSE_LAB_LIST_FIELD (b);
return true;
}
/* http://www.ece.rochester.edu/~gsharma/ciede2000/ciede2000noteCRNA.pdf> */
DEFUN ("lcms-cie-de2000", Flcms_cie_de2000, Slcms_cie_de2000, 2, 5, 0,
doc: /* Compute CIEDE2000 metric distance between COLOR1 and COLOR2.
Each color is a list of L*a*b* coordinates, where the L* channel ranges from
0 to 100, and the a* and b* channels range from -128 to 128.
Optional arguments KL, KC, KH are weighting parameters for lightness,
chroma, and hue, respectively. The parameters each default to 1. */)
(Lisp_Object color1, Lisp_Object color2,
Lisp_Object kL, Lisp_Object kC, Lisp_Object kH)
{
cmsCIELab Lab1, Lab2;
cmsFloat64Number Kl, Kc, Kh;
if (!(init_lcms_functions ()))
return Qnil;
if (!(CONSP (color1) && parse_lab_list (color1, &Lab1)))
signal_error ("Invalid color", color1);
if (!(CONSP (color2) && parse_lab_list (color2, &Lab2)))
signal_error ("Invalid color", color1);
if (NILP (kL))
Kl = 1.0f;
else if (!(NUMBERP (kL) && (Kl = XFLOATINT(kL))))
wrong_type_argument(Qnumberp, kL);
if (NILP (kC))
Kc = 1.0f;
else if (!(NUMBERP (kC) && (Kc = XFLOATINT(kC))))
wrong_type_argument(Qnumberp, kC);
if (NILP (kL))
Kh = 1.0f;
else if (!(NUMBERP (kH) && (Kh = XFLOATINT(kH))))
wrong_type_argument(Qnumberp, kH);
return make_float (cmsCIE2000DeltaE (&Lab1, &Lab2, Kl, Kc, Kh));
}
static double
deg2rad (double degrees)
{
return M_PI * degrees / 180.0;
}
static cmsCIEXYZ illuminant_d65 = { .X = 95.0455, .Y = 100.0, .Z = 108.8753 };
static void
default_viewing_conditions (const cmsCIEXYZ *wp, cmsViewingConditions *vc)
{
vc->whitePoint.X = wp->X;
vc->whitePoint.Y = wp->Y;
vc->whitePoint.Z = wp->Z;
vc->Yb = 20;
vc->La = 100;
vc->surround = AVG_SURROUND;
vc->D_value = 1.0;
}
/* FIXME: code duplication */
static bool
parse_xyz_list (Lisp_Object xyz_list, cmsCIEXYZ *color)
{
#define PARSE_XYZ_LIST_FIELD(field) \
if (CONSP (xyz_list) && NUMBERP (XCAR (xyz_list))) \
{ \
color->field = 100.0 * XFLOATINT (XCAR (xyz_list)); \
xyz_list = XCDR (xyz_list); \
} \
else \
return false;
PARSE_XYZ_LIST_FIELD (X);
PARSE_XYZ_LIST_FIELD (Y);
PARSE_XYZ_LIST_FIELD (Z);
return true;
}
static bool
parse_viewing_conditions (Lisp_Object view, const cmsCIEXYZ *wp,
cmsViewingConditions *vc)
{
#define PARSE_VIEW_CONDITION_FLOAT(field) \
if (CONSP (view) && NUMBERP (XCAR (view))) \
{ \
vc->field = XFLOATINT (XCAR (view)); \
view = XCDR (view); \
} \
else \
return false;
#define PARSE_VIEW_CONDITION_INT(field) \
if (CONSP (view) && NATNUMP (XCAR (view))) \
{ \
CHECK_RANGED_INTEGER (XCAR (view), 1, 4); \
vc->field = XINT (XCAR (view)); \
view = XCDR (view); \
} \
else \
return false;
PARSE_VIEW_CONDITION_FLOAT (Yb);
PARSE_VIEW_CONDITION_FLOAT (La);
PARSE_VIEW_CONDITION_INT (surround);
PARSE_VIEW_CONDITION_FLOAT (D_value);
if (! NILP (view))
return false;
vc->whitePoint.X = wp->X;
vc->whitePoint.Y = wp->Y;
vc->whitePoint.Z = wp->Z;
return true;
}
/* References:
Li, Luo et al. "The CRI-CAM02UCS colour rendering index." COLOR research
and application, 37 No.3, 2012.
Luo et al. "Uniform colour spaces based on CIECAM02 colour appearance
model." COLOR research and application, 31 No.4, 2006. */
DEFUN ("lcms-cam02-ucs", Flcms_cam02_ucs, Slcms_cam02_ucs, 2, 4, 0,
doc: /* Compute CAM02-UCS metric distance between COLOR1 and COLOR2.
Each color is a list of XYZ tristimulus values, with Y scaled about unity.
Optional argument WHITEPOINT is the XYZ white point, which defaults to
illuminant D65.
Optional argument VIEW is a list containing the viewing conditions, and
is of the form (YB LA SURROUND DVALUE) where SURROUND corresponds to
1 AVG_SURROUND
2 DIM_SURROUND
3 DARK_SURROUND
4 CUTSHEET_SURROUND
The default viewing conditions are (20 100 1 1). */)
(Lisp_Object color1, Lisp_Object color2, Lisp_Object whitepoint,
Lisp_Object view)
{
cmsViewingConditions vc;
cmsJCh jch1, jch2;
cmsHANDLE h1, h2;
cmsCIEXYZ xyz1, xyz2, xyzw;
double Jp1, ap1, bp1, Jp2, ap2, bp2;
double Mp1, Mp2, FL, k, k4;
if (!(init_lcms_functions ()))
return Qnil;
if (!(CONSP (color1) && parse_xyz_list (color1, &xyz1)))
signal_error ("Invalid color", color1);
if (!(CONSP (color2) && parse_xyz_list (color2, &xyz2)))
signal_error ("Invalid color", color2);
if (NILP (whitepoint))
xyzw = illuminant_d65;
else if (!(CONSP (whitepoint) && parse_xyz_list (whitepoint, &xyzw)))
signal_error ("Invalid white point", whitepoint);
if (NILP (view))
default_viewing_conditions (&xyzw, &vc);
else if (!(CONSP (view) && parse_viewing_conditions (view, &xyzw, &vc)))
signal_error ("Invalid view conditions", view);
h1 = cmsCIECAM02Init (0, &vc);
h2 = cmsCIECAM02Init (0, &vc);
cmsCIECAM02Forward (h1, &xyz1, &jch1);
cmsCIECAM02Forward (h2, &xyz2, &jch2);
cmsCIECAM02Done (h1);
cmsCIECAM02Done (h2);
/* Now have colors in JCh, need to calculate J'a'b'
M = C * F_L^0.25
J' = 1.7 J / (1 + 0.007 J)
M' = 43.86 ln(1 + 0.0228 M)
a' = M' cos(h)
b' = M' sin(h)
where
F_L = 0.2 k^4 (5 L_A) + 0.1 (1 - k^4)^2 (5 L_A)^(1/3),
k = 1/(5 L_A + 1)
*/
k = 1.0 / (1.0 + (5.0 * vc.La));
k4 = k * k * k * k;
FL = vc.La * k4 + 0.1 * (1 - k4) * (1 - k4) * cbrt (5.0 * vc.La);
Mp1 = 43.86 * log (1.0 + 0.0228 * (jch1.C * sqrt (sqrt (FL))));
Mp2 = 43.86 * log (1.0 + 0.0228 * (jch2.C * sqrt (sqrt (FL))));
Jp1 = 1.7 * jch1.J / (1.0 + (0.007 * jch1.J));
Jp2 = 1.7 * jch2.J / (1.0 + (0.007 * jch2.J));
ap1 = Mp1 * cos (deg2rad (jch1.h));
ap2 = Mp2 * cos (deg2rad (jch2.h));
bp1 = Mp1 * sin (deg2rad (jch1.h));
bp2 = Mp2 * sin (deg2rad (jch2.h));
return make_float (sqrt ((Jp2 - Jp1) * (Jp2 - Jp1) +
(ap2 - ap1) * (ap2 - ap1) +
(bp2 - bp1) * (bp2 - bp1)));
}
DEFUN ("lcms-temp->white-point", Flcms_temp_to_white_point, Slcms_temp_to_white_point, 1, 1, 0,
doc: /* Return XYZ black body chromaticity from TEMPERATURE given in K.
Valid range of TEMPERATURE is from 4000K to 25000K. */)
(Lisp_Object temperature)
{
cmsFloat64Number tempK;
cmsCIExyY whitepoint;
cmsCIEXYZ wp;
if (!(init_lcms_functions ()))
return Qnil;
CHECK_NUMBER_OR_FLOAT (temperature);
tempK = XFLOATINT (temperature);
if (!(cmsWhitePointFromTemp (&whitepoint, tempK)))
signal_error("Invalid temperature", temperature);
cmsxyY2XYZ (&wp, &whitepoint);
return list3 (make_float (wp.X), make_float (wp.Y), make_float (wp.Z));
}
/* Initialization */
void
syms_of_lcms2 (void)
{
defsubr (&Slcms_cie_de2000);
defsubr (&Slcms_cam02_ucs);
defsubr (&Slcms_temp_to_white_point);
Fprovide (intern_c_string ("lcms2"), Qnil);
}
#endif /* HAVE_LCMS2 */